In FM stereobroadcasting, a pilot tone of 19 kHz indicates that there is stereophonic information at 38 kHz (19×2, the second harmonic of the pilot). The receiver doubles the frequency of the pilot tone and uses it as a phase reference to demodulate the stereo information.

If no 19 kHz pilot tone is present, then any signals in the 23-53 kHz range are ignored by a stereo receiver. A guard band of ±4 kHz (15-23 kHz) protects the pilot tone from interference from the basebandaudio signal (50 Hz-15 kHz) and from the lower sideband of the double sideband stereo information (23-53 kHz). The third harmonic of the pilot (19×3, or 57 kHz) is used for Radio Data System.

In FM stereobroadcasting, a pilot tone of 19 kHz indicates that there is stereophonic information at 38 kHz (19×2, the second harmonic of the pilot). The receiver doubles the frequency of the pilot tone and uses it as a phase reference to demodulate the stereo information.

If no 19 kHz pilot tone is present, then any signals in the 23-53 kHz range are ignored by a stereo receiver. A guard band of ±4 kHz (15-23 kHz) protects the pilot tone from interference from the basebandaudio signal (50 Hz-15 kHz) and from the lower sideband of the double sideband stereo information (23-53 kHz). The third harmonic of the pilot (19×3, or 57 kHz) is used for Radio Data System.

Latest News for: pilot signal

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A young pilot who wanted to signal to his bride instead died virtually before her eyes, near his home, taking his copilot with him ... The pilot was Marine Corps2nd Lt ... As he flew east toward Cherry Point, he diverted his course by a few miles to circle the lake in a prearranged signal that he wouldn’t be back in Charlotte that night ... He was signaling goodbye right before he crashed....

A young pilot who wanted to signal to his bride instead died virtually before her eyes, near his home, taking his copilot with him ... The pilot was Marine Corps2nd Lt ... As he flew east toward Cherry Point, he diverted his course by a few miles to circle the lake in a prearranged signal that he wouldn’t be back in Charlotte that night ... Military investigators dismissed engine failure as the cause and ruled the crash was piloterror....

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LOS ANGELES — They’ve been crammed into toilets, tossed off balconies and set on fire. They’ve even been adorned with dangling bags of dog droppings ... These vandals are destroying or desecrating the vehicles in disturbingly imaginative ways, and celebrating their illegal deeds on social media — in full view of authorities and the public ... Lt ... They complain that scooter pilots zip through and around traffic without obeying traffic signals ... ....